* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 1901px;
    background-color: #f3f5f7;
}

/*header部分*/
.header {
    position: relative;
    background-color: #ffffff;
    margin: 0px auto;
    height: 100px;
}

.header>div {
    display: flex;
    justify-content: space-between;
    border: 1px solid transparent;
}

.logo {
    position: absolute;
    left: 8%;
    top: -0.7px;
    justify-content: center;
    align-items: center;
}

.logo>img {
    vertical-align: middle;
    object-fit: fill;
    height: 60px;
    margin-top: 20px;
}

.nav {
    position: absolute;
    left: 25%;
    height: 100%;
    width: 30%;
}

.nav>ul {
    display: flex;
    justify-content: space-between;
    margin: 25px;
    margin-left: 90px;
    margin-right: 90px;
    align-items: center;
    list-style: none;
}

a {
    text-decoration: none;
    color: #000;
}

.nav li a:hover {
    border-bottom: 2px solid #00a4ff;
}

.nav>ul>li {
    font-size: 20px;
    padding: 5px;
}

.search {
    display: flex;
    position: absolute;
    right: 25%;
    top: 25%;
    width: 18%;
    height: 40px;
    border: 1px solid transparent;
    background-color: #e1dbdb;
    border-radius: 10px;
    overflow: hidden;

}

.search>input {
    margin-left: 15px;
    margin-right: 30px;
    border: 0;
    outline: none;
    width: 80%;
    background-color: #e1dbdb;
}

.search a {
    display: block;
    align-self: center;
    width: 10%;
    height: 20px;
    background-image: url(../image/搜索.svg);
    background-repeat: no-repeat;
    background-size: 25px;
    background-position: 0px;
}

.user {
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translate(0, -50%);
    height: 50px;
    margin-right: 10px;
}

.user a {
    width: 150px;
    height: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user img {
    width: 40px;
    height: 40px;
    overflow: hidden;
    object-fit: cover;
    border-radius: 50%;
    vertical-align: middle;
    margin-bottom: 5px;
    margin-right: 5px;
    background-size: cover;
    display: block;
}

.user span {
    font-size: 18px;
    color: #333232;
}

/*banner部分*/
.banner {
    height: 420px;
    background-color: #dc2a2a;
    position: relative;
    display: block;
}

.banner>img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    vertical-align: middle;
}

.wrapper {
    display: flex;
    height: 100%;
    justify-content: space-between;
    z-index: 1;
}

.left {
    position: absolute;
    top: 0%;
    display: flex;
    height: 100%;
    margin-left: 10%;
    z-index: 2;
    background-color: #7f6d6d;
    opacity: 0.8;
}

.left>ul {
    width: 200px;
    list-style: none;
    margin-left: 10px;
}

.left>ul>li {
    display: flex;
    justify-content: space-between;
    font-size: 16px;
    padding: 11px;
    cursor: pointer;
}

.left>ul>li>a {
    width: 80%;
    color: #ffffff;
}

.left>ul>li>span {
    text-align: right;
    color: #ffffff;
}

.left>ul>li:hover a,
.left>ul>li:hover span {
    color: #00a4ff;
}

.right {
    width: 240px;
    height: 80%;
    background-color: #00a4ff;
    position: absolute;
    border-radius: 5px;
    top: 50%;
    left: 77%;
    transform: translate(0, -50%);
    z-index: 2;
    overflow: hidden;
}

.right>h3 {

    height: 15%;
    color: #ffffff;
    padding-top: 15px;
    padding-left: 10px;
}

.right>div {
    width: 99%;
    margin-left: 1px;
    margin-bottom: 0.5px;
    z-index: 3;
    height: 84.5%;
    background-color: #ffffff;
    padding-left: 10px;
    border-radius: 10px;
    padding-top: 3px;
}

.right>div>dl {
    border-bottom: #d4d4d4 1px solid;
}

.right>div>dl>dt,
.right>div>dl>dd {
    font-size: 16px;
    padding-left: 2\1px;
    margin-top: 8px;
    margin-bottom: 8px;
}

.right>div>dl>dd>span {
    color: #00a4ff;
}

.right>div>button {
    background-color: #00a4ff;
    color: #ffffff;
    border: 0;
    text-align: center;
    border-radius: 10px;
    width: 200px;
    height: 30px;
    margin-top: 15px;
    margin-left: 7px;

}

/*精品推荐部分*/
.recommend {
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.3);
    display: flex;
    height: 60px;
    width: 80%;
    margin: 3px auto;
    border-radius: 3px;
    background-color: #ffffff;
}

.recommend>ul {
    display: flex;
    width: 80%;
    list-style: none;
    padding-right: 10px;
    justify-content: space-between;
}

.recommend>ul>li {
    width: 10%;
    margin-top: 18px;
    border-right: 1px solid #dbd9d9;
    cursor: pointer;
    text-align: center;
}

.recommend>h3 {
    color: #00a4ff;
    margin-left: 15px;
    margin-top: 12px;
    margin-right: 30px;
}

.recommend>ul>li:hover a {
    color: #00a4ff;
}

.recommend>a {
    color: #00a4ff;
    margin-top: 15px;
    margin-left: 100px;
}

/*精品推荐课程*/
.course {
    width: 80%;
    margin: 0px auto;
}

.bd>ul {
    display: flex;
    list-style: none;
    justify-content: space-between;
    flex-wrap: wrap;
    align-content: center;
}

.bd>ul>li {
    width: 20%;
    margin-bottom: 10px;
    padding: 10px;
    cursor: pointer;
}

.bd>ul>li>div img {
    overflow: hidden;
    width: 280px;
    height: 180px;
    background-size: cover;
    display: block;
}

.hd {
    display: flex;
    height: 40px;
    width: 100%;
    justify-content: space-between;
    align-items: center;
}

.hd h3 {
    color: #5e5e5e;
}

.hd>a {
    color: #5e5e5e;
}

.bddiv {
    position: relative;
    height: 140px;
    background-color: #ffffff;
    padding: 20px;
}

.bddiv span {
    color: #ff9e0d;
}

.bddiv p {
    position: absolute;
    bottom: 25px;
    color: #989696;
}

/*前端开发工程师区域*/
.web {
    width: 80%;
    margin: 0px auto;
}

.hr {
    height: 60px;
    display: flex;
    /* border-radius: 5px 5px 0px 0px; */
}

.hr>h3 {
    margin: 15px;
}

.hr ul {
    list-style: none;
    width: 30%;
    margin: 0px auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.hr ul>li {
    height: 100%;
    font-size: 20px;
    padding: 10px;
    color: #787878;
    cursor: pointer;
}

.hr a {
    color: #5e5e5e;
    margin: 15px;
}

.hr ul>li:hover {
    color: #00a4ff;
}

.bott {
    width: 100%;
    height: 470px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

.bottleft {
    height: 100%;
    width: 21%;
    z-index: 3;
    margin-right: 20px;
    background-color: rgb(61, 196, 186);
}

.bottright {
    height: 100%;
    width: 79%;
    z-index: 3;
}

.righttop {
    width: 100%;
    height: 120px;
    background-color: #c62323;
}

.rightbottom ul {
    list-style: none;
    display: flex;

    margin-top: 20px;
}

.rightbottom ul>li img {
    width: 280px;
    background-size: cover;
    vertical-align: middle;

}

.rightbottom ul>li {
    width: 280px;
    margin-bottom: 10px;
    margin-right: 25px;
    cursor: pointer;
}

.hrdiv {
    position: relative;
    height: 140px;
    background-color: #ffffff;
    padding: 20px;
}

.hrdiv span {
    color: #ff9e0d;
}

.hrdiv p {
    position: absolute;
    bottom: 25px;
    color: #989696;
}

/* .bottleft h2,
.bottleft h3 {
    color: #ffffff;
    margin-left: 20px;
    margin-bottom: 10px;

}

.bottleft h2 {
    margin-top: 50px;
} */
.bottleft>img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    vertical-align: middle;
}

.righttop>img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    vertical-align: middle;
}

.footer {
    background-color: #ffffff;
    width: 100%;
    height: 300px;
    margin-top: 20px;

}

.footer-main {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}

.footer-left {
    width: 40%;
    height: 100%;
    margin-left: 10%;
}

.footer-right {
    width: 42%;
    height: 100%;
    margin-left: 8%;
    display: flex;
}

.footer-left>img {
    width: 245px;
    height: 60px;
    margin-top: 20px;
    vertical-align: middle;
    object-fit: fill;
    margin-bottom: 20px;
}

.footer-left>p {
    margin-bottom: 20px;
    font-size: 18px;
    color: #353535;
}

.footer-right>dl {
    margin: 40px;
}

.footer-right>dl>dt {
    margin-bottom: 20px;
    font-weight: 600;
    font-size: 18px;
}

.footer-right>dl>dd {
    margin-bottom: 10px;
    font-size: 18px;
}

.footer-right>dl>dd>a {
    color: #353535;
}